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Argatroban

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Argatroban

Indications
Dosage
How Supplied

INDICATIONS

Heparin Induced Thrombocytopenia

Argatroban Injection is indicated for prophylaxis or treatment of thrombosis in adult patients with heparin-induced thrombocytopenia (HIT).

Percutaneous Coronary Intervention

Argatroban Injection is indicated as an anticoagulant in adult patients with or at risk for HIT undergoing percutaneous coronary intervention (PCI).

DOSAGE AND ADMINISTRATION

Each 50 mL glass Vial contains 50 mg argatroban (1 mg/mL); and, as supplied, is ready for intravenous infusion. Dilution is not required.

Argatroban Injection is a clear, colorless to pale yellow solution. Parenteral drug products should be inspected visually for particulate matter and discoloration prior to administration whenever solution and container permit. Do not use if solution is cloudy, contains precipitates, or if the white flip top cap is not intact.

Vial may be inverted for use with a medical infusion set.

Dosing in Patients with Heparin-Induced Thrombocytopenia

Initial Dosage

Before administering argatroban, discontinue heparin therapy and obtain a baseline aPTT. The recommended initial dose of Argatroban for adult patients without hepatic impairment is 2 mcg/kg/min, administered as a continuous infusion (see Table 1).

Table 1: Recommended Doses and Infusion Rates for 2 mcg/kg/min Dose of Argatroban for Patients With HIT*and Without Hepatic Impairment (1 mg/mL Concentration)

Body Weight (kg) Dose (mcg/min) Infusion Rate (mL/hr)
50 100 6
60 120 7
70 140 8
80 160 10
90 180 11
100 200 12
110 220 13
120 240 14
130 260 16
140 280 17
*with or without thrombosis

Monitoring Therapy

For use in HIT, therapy with Argatroban Injection is monitored using the aPTT with a target range of 1.5 to 3 times the initial baseline value (not to exceed 100 seconds). Tests of anticoagulant effects (including the aPTT) typically attain steady-state levels within 1 to 3 hours following initiation of Argatroban Injection. Check the aPTT 2 hours after initiation of therapy and after any dose change to confirm that the patient has attained the desired therapeutic range.

Dosage Adjustment

After the initiation of Argatroban Injection, adjust the dose (not to exceed 10 mcg/kg/min) as necessary to obtain a steady state aPTT in the target range [see Clinical Studies].

Dosing in Patients Undergoing Percutaneous Coronary Intervention

Initial Dosage

Initiate an infusion of Argatroban Injection at 25 mcg/kg/min and administer a bolus of 350 mcg/kg via a large bore intravenous line over 3 to 5 minutes (see Table 2). Check an activated clotting time (ACT) 5 to 10 minutes after the bolus dose is completed. The PCI procedure may proceed if the ACT is greater than 300 seconds.

Dosage Adjustment

If the ACT is less than 300 seconds, an additional intravenous bolus dose of 150 mcg/kg should be administered, the infusion dose increased to 30 mcg/kg/min, and the ACT checked 5 to 10 minutes later (see Table 2).

If the ACT is greater than 450 seconds, the infusion rate should be decreased to 15 mcg/kg/min, and the ACT checked 5 to 10 minutes later (Table 3).

Continue titrating the dose until a therapeutic ACT (between 300 and 450 seconds) has been achieved; continue the same infusion rate for the duration of the PCI procedure.

In case of dissection, impending abrupt closure, thrombus formation during the procedure, or inability to achieve or maintain an ACT over 300 seconds, additional bolus doses of 150 mcg/kg may be administered and the infusion dose increased to 40 mcg/kg/min. Check the ACT after each additional bolus or change in the rate of infusion.

Table 2 : Recommended Starting and Maintenance Doses (Within the Target ACT Range) of Argatroban Injection in Patients Undergoing PCI Without Hepatic Impairment (1 mg/mL Concentration)

Body Weight (kg) Starting Bolus Dose (350 mcg/kg) Starting Maintenance Continuous Infusion Dosing For ACT 300-450 seconds 25 mcg/kg/min
Bolus Dose(mcg) Bolus Volume (mL) Continuous Infusion Dose (mg/min) Continuous Infusion Rate (mL/hr)
50 17500 18 1250 75
60 21000 21 1500 90
70 24500 25 1750 105
80 28000 28 2000 120
90 31500 32 2250 135
100 35000 35 2500 150
110 38500 39 2750 165
120 42000 42 3000 180
130 45500 46 3250 195
140 49000 49 3500 210
NOTE: 1 mg = 1000 mcg; 1 kg = 2.2 lbs

Table 3 : Recommended Dose Adjustments of Argatroban Injection for Patients Outside of ACT Target Range Undergoing PCI Without Hepatic Impairment (1 mg/mL Concentration)

Body Weight (kg) If ACT Less than 300 seconds
Dosage Adjustment†
30 mcg/kg/min
If ACT Greater than 450 seconds
Dosage Adjustment* 15 mcg/kg/min
Additional Bolus Dose (mcg) Bolus Volume (mL) Continuous Infusion Dose (mcg/min) Continuous Infusion Rate (mL/hr) Continuous Infusion Dose (mcg/min) Continuous Infusion Rate (mL/hr)
50 7500 8 1500 90 750 45
60 9000 9 1800 108 900 54
70 10500 11 2100 126 1050 63
80 12000 12 2400 144 1200 72
90 13500 14 2700 162 1350 81
100 15000 15 3000 180 1500 90
110 16500 17 3300 198 1650 99
120 18000 18 3600 216 1800 108
130 19500 20 3900 234 1950 117
140 21000 21 4200 252 2100 126
NOTE: 1 mg = 1000 mcg; 1 kg – 2.2 lbs
† Additional intravenous bolus dose of 150 mcg/kg should be administered if ACT less than 300 seconds.
* No bolus dose is given if ACT greater than 450 seconds.

Monitoring therapy

For use in PCI, therapy with Argatroban Injection is monitored using ACT. Obtain ACTs before dosing, 5 to 10 minutes after bolus dosing, following adjustments in the infusion rate, and at the end of the PCI procedure. Obtain additional ACTs every 20 to 30 minutes during a prolonged procedure.

Continued Anticoagulation after PCI

If a patient requires anticoagulation after the procedure, Argatroban Injection may be continued, but at a rate of 2 mcg/kg/min and adjusted as needed to maintain the aPTT in the desired range [see DOSAGE AND ADMINISTRATION].

Dosing in Patients with Hepatic Impairment

For adult patients with HIT and moderate or severe hepatic impairment (based on Child-Pugh classification), an initial dose of 0.5 mcg/kg/min is recommended, based on the approximately 4-fold decrease in argatroban clearance relative to those with normal hepatic function. Monitor the aPTT closely, and adjust the dosage as clinically indicated.

Monitoring Therapy

Achievement of steady state aPTT levels may take longer and require more dose adjustments in patients with hepatic impairment compared to patients with normal hepatic function.

For patients with hepatic impairment undergoing PCI who have HIT or are at risk for HIT, carefully titrate argatroban until the desired level of anticoagulation is achieved. Use of Argatroban in PCI patients with clinically significant hepatic disease or AST/ALT levels ≥ 3 times the upper limit of normal should be avoided. [see WARNINGS AND PRECAUTIONS].

Dosing in Pediatric Patients With Heparin-Induced Thrombocytopenia/Heparin-Induced Thrombocytopenia and Thrombosis Syndrome

Initial Dosage

Initial argatroban infusion doses are lower for seriously ill pediatric patients compared to adults with normal hepatic function [see Use In Specific Populations].

Monitoring Therapy

In general, therapy with argatroban is monitored using the aPTT. Tests of anticoagulant effects (including the aPTT) typically attain steady-state levels within one to three hours following initiation of argatroban in patients without hepatic impairment [see WARNINGS AND PRECAUTIONS]. Dose adjustment may be required to attain the target aPTT. Check the aPTT two hours after initiation of therapy and after any dose change to confirm that the patient has attained the desired therapeutic range.

Dosage Adjustment

[see Use In Specific Populations]

Conversion to Oral Anticoagulant Therapy

Initiating Oral Anticoagulant Therapy

When converting patients from Argatroban to oral anticoagulant therapy, consider the potential for combined effects on the International Normalized Ratio (INR). To avoid prothrombotic effects and to ensure continuous anticoagulation when initiating warfarin, overlap Argatroban Injection and warfarin therapy. There are insufficient data available to recommend the duration of the overlap. Initiate therapy using the expected daily dose of warfarin. A loading dose of warfarin should not be used.

The relationship between INR and bleeding risk is altered when argatroban and warfarin are co-administered. The combination of argatroban and warfarin does not cause further reduction in the vitamin-K dependent factor Xa activity than that which is seen with warfarin alone. The relationship between INR obtained on combined therapy and INR obtained on warfarin alone is dependent on both the dose of argatroban and the thromboplastin reagent used. The INR value on warfarin alone (INRw) can be calculated from the INR value on combination argatroban and warfarin therapy [see DRUG INTERACTIONS and CLINICAL PHARMACOLOGY].

Co-Administration of Warfarin and Argatroban Injection at Doses up to 2 mcg/kg/min

Measure INR daily while Argatroban Injection and warfarin are co-administered. In general, with doses of Argatroban Injection up to 2 mcg/kg/min, Argatroban Injection can be discontinued when the INR is greater than 4 on combined therapy. After Argatroban Injection is discontinued, repeat the INR measurement in 4 to 6 hours. If the repeat INR is below the desired therapeutic range, resume the infusion of Argatroban Injection and repeat the procedure daily until the desired therapeutic range on warfarin alone is reached.

Co-Administration of Warfarin and Argatroban Injection at Doses Greater than 2 mcg/kg/min

For doses greater than 2 mcg/kg/min, the relationship of INR between warfarin alone to the INR on warfarin plus argatroban is less predictable. In this case, in order to predict the INR on warfarin alone, temporarily reduce the dose of Argatroban Injection to a dose of 2 mcg/kg/min. Repeat the INR on Argatroban Injection and warfarin 4 to 6 hours after reduction of the Argatroban Injection dose and follow the process outlined above for administering Argatroban Injection at doses up to 2 mcg/kg/min.

HOW SUPPLIED

Dosage Forms And Strengths

Argatroban Injection is supplied in a single use vial containing 50 mg argatroban in 50 mL aqueous solution (1 mg/mL). The solution is ready for intravenous infusion.

Storage And Handling

Argatroban Injection is supplied in a single use vial containing 50 mg argatroban in 50 mL of aqueous solution (1 mg/mL).

NDC 42367-203-07 – Package containing one vial of Argatroban Injection (each vial contains 50 mg of argatroban).

Storage

Store the Vials in original cartons at 20° – 25° C (68° – 77° F) (see USP Controlled Room Temperature). Do not freeze. Retain in the original carton to protect from light.

Manufactured by: Cipla Ltd., India For: Eagle Pharmaceuticals, Inc. Woodcliff Lake, N.J. 07677. Revised: June 2011

Last reviewed on RxList: 8/10/2011
This monograph has been modified to include the generic and brand name in many instances.

Indications
Dosage
How Supplied
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